Stabilization of the Homotopy Groups of the Moduli Spaces of $k$-Higgs Bundles

Abstract

The work of Hausel proves that the Białynicki-Birula stratification of the moduli space of rank two Higgs bundles coincides with its Shatz stratification. He uses that to estimate some homotopy groups of the moduli space of $k$-Higgs bundles of rank two. Unfortunately, those two stratifications do not coincide in general. Here, the objective is to present a different proof of the stabilization of the homotopy groups of ${\mathcal{M}}^k(2,d)$, and generalize it to ${\mathcal{M}}^k(3,d)$, the moduli spaces of $k$-Higgs bundles of degree $d$, and ranks two and three respectively, using the results from the works of Hausel and Thaddeus, among other tools.

arXiv comment19 pages, v3 updated version, corrected typos; to appear in Revista Colombiana de Matemáticas